QUESTION 15 [Waiting time in a store] Let u denote the average waiting time of a customer in a local grocery store. The manager of the store wants to test the following hypothesis: Ho: / $ 5 Hoi # > 5. To assess this, the manager has taken a random sample of 100 customers and recorded their waiting times. From the sample, the average length of time it took these 100 customers to check out was 4.5 minutes and the sample standard deviation is 2 minutes. The test statistic is O a. 2.00 O b.-2.5 O C. 1.82 O d. 2.50 QUESTION 16 [Waiting time in a store] Let u denote the average waiting time of a customer in a local grocery store. The manager of the store wants to test the following hypothesis: Ho: us 5 Hoi # > 5. To assess this, the manager has taken a random sample of 100 customers and recorded their waiting times. From the sample, the average length of time it took these 100 customers to check out was 5.5 minutes and the sample standard deviation is 2 minutes. The p-value of the test statistic should be calculated in Excel using which functions below O a. t.dist.rt(t-stat, 100) O b. t. dist.rt(t-stat, 99) O C t.dist.2t(t-stat, 100) O d. t. dist(t-stat, 99, 1) QUESTION 17 [Quality of chocolate chip cookies] A sample of 18 cookies is taken to test the current belief that each cookie contains at least 8 chocolate chips. Let u denote the average number of chocolate chips in all the cookies. The hypothesis to test the belief is: HQ: / 2 8 Ho: p